Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff02e61651c6fb3…

MALICIOUS

PDF

66.9 KB Created: 2020-12-15 10:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b28974cd98b4543128812809d4b94e17 SHA-1: d33f889c511394e0c96c83b18fcfa2c79527e51f SHA-256: 1ff02e61651c6fb309505322d355e03f5079f50f3561d1d0d33d2fb062945eb7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/strik?utm_term=chemistry+dimensional+analysis+worksheet+6 PDF link annotation
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/7d06611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_5fab7173ec8d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f8a8d3fa51cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fb7ec15710b0.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/kusog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fb2d3f01b12a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_5f9d77457bfd7.pdfIn PDF document text
    • https://xugirudubup.weebly.com/uploads/1/3/4/3/134332480/bapodowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446776/normal_5f9f85c272fd4.pdfIn PDF document text
    • https://munevamowiwefan.weebly.com/uploads/1/3/4/4/134440094/2385082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6a9bf104edf1d77a96fef/t/5fcbf3e8260a660a6bc49f15/1607201770350/my_talking_tom_hack_mod_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/89306308843.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/vigadalogumibofiwekariver.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/abac_air_compressor_user_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 5384 bytes
SHA-256: 9eb7be16b0a8ff3ee8b72bb6520dea066dfa991c0d08778a2f3c920912c7b9aa
font_01_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10448 bytes
SHA-256: 8896556ab7e138a22670e91ef48c3c644fcbeca3150a7b0fd7a05b046b2a1467

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